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(Free) Ogre - http://www.ogre3d.org/ - My favorite of free 3D engines, another free open source engine, it has a great community, and a really cool resource managment system! It also has a great Particle editor!

(Free) Delta 3D - http://www.delta3d.org - This is an open-source 3D gaming and simulation engine. It's free to use it any way you wish, and is designed to easily work with any other open-source programming project.

(Free) Panda 3D - http://www.panda3d.org - This is the same engine that was used to create Disney's ToonTown. Disney then threw into the open-source ring. You can now download it for free to use in whatever you like. It has both Python and C++ bindings, supposedly the Python ones are almost as fast as the C++ ones.

(Free for Windows/Linux) Q Developer Network - http://qdn.qubesoft.com/index.php?main=home - This engine is cross-platform, but for the free version it can only be made for Windows and Linux. If you pay money, you can get it on OSX, FreeBSD, PS2, and Xbox. Other than the engine, it also comes with a pretty easy to use WYSIWYG scene editing tool.

(Free) The Nebula Device - http://www.nebuladevice.org/ - This is is open-source, multiplatform, and has API's and libraries to couple it with just abouty any scripting or programming language. Their idea is to make things simple, sweet, and powerful. Each release has shorter more efficient code than the last.

Torque - http://www.garagegames.com - Torque costs $100 for a license, but is a very powerful and extremely popular game development engine/system. Many commercial games (remember Tribes?) were made using this.